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A pooled estimate of the standard error is a poorer estimate of the standard error than one based on the variance from either sample.
Perianal Pain
Pain located around the anus, which can be caused by various conditions including hemorrhoids, fissures, or abscesses.
Sigmoid Colon
The part of the large intestine closest to the rectum and anus, forming an S-shaped curve.
Colonoscope
A thin, flexible tube equipped with a camera and light at the end, used to examine the inside of the colon.
Proctoscope
A medical instrument designed for the visual examination of the rectum.
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